perf: decode rewrite, encode zeros optimization, iai-callgrind benchmarks (0.3.1)
Decode rewritten with shrinking-slice pattern (split_first/split_at) instead of index arithmetic. Decode zeros 14% faster, decode nonzero flips from 5% behind corncobs to 2% ahead, decode mixed closes to tied. Encode zeros fast path moved before split_at — now tied with cobs (was 6% behind). Code size reduced to 821B (was 869B). Replaced criterion with iai-callgrind for deterministic instruction-count benchmarks via Valgrind. Zero run-to-run variance. Expanded to 162 benchmarks across 9 sizes. ucobs now wins or ties 16 of 18 benchmarks vs corncobs and cobs. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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